中亚热带人工米槠林分生产力

Study on Productivity of Castanopsis carlesii Forest in Mid-subtropical Zone

在福建省沙县官庄国有林场,以同年度、相似立地条件下的人促米槠林和杉木林为对照,从林分生长、生物量及其分配和空间格局、净生产量、叶净同化率等方面,对17年生人工米槠林的林分生产力进行研究。结果表明:现存密度875株·hm^(-2)的人工米槠林,平均胸径25.7 cm,平均树高14.5 m,单株立木材积0.3534 m3·株-1,林分立木材积309.225m3·hm^(-2),平均木生物量148.06 kg·株-1,年净生长量8.71 kg·株-1·a-1,叶对树干净同化率达115.55 g·m-2·a-1,树冠生长发育较完整,单木生长量、生物量均高于人促米槠林和杉木林,具有较高的生产力。以培育优质大径材为目的的人工米槠林现存密度875株·hm^(-2)是适宜的,有利于培育大径材。

In this paper, artificial promoting regeneration Castanopsis carlesii plantation and Chinese fir plantation with the same age and similar soil condition were selected as control, which were used to compare with the 17-year-old artificial Castanopsis carlesii plantation on the wood growth,biomass accumulation, allocation and spatial pattern, net primary production and net leaf assimilarre height, single standing tree volume, discrete wood product average wood biomass, net productivity and net assimilation rate of Castan- opsis carlesii plantation with density of 875 trees hm-2 were 25.7 cm, 14. 5 m,0. 3534 m3 tree-1,309. 225 m3 hm-2 ,148. 06 kg. tree-t ,8.71 kg a-1. tree-1 ,and 115.55 g m-2 a-1 ,respectively. Single standing tree canopy,individual volume and aver- age biomass of Castanopsis carlesii plantation with density of 875 trees hm-2 performed better than promoting regeneration Castan- opsis carlesii plantation and Chinese fir plantation. Therefore, the density of 875 trees hm-2 is a good management choice and facili- tates cultivation of large diameter timber.